Specialists of the Novosibirsk State University and the Institute of Nuclear Physics. Budker SB RAS took part in the 38th International Conference in the field of high energy physics in Chicago (ICHEP-2016). Head of the research laboratories at NSU and BINP Ivan Logashenko presented at the conference data of accelerator-storage complex VEhPP-2000, which are important for the theoretical calculation of the anomalous magnetic moment of the muon.
The biggest International Conference on High Energy Physics is organized every two years and gathers scientists working in the field of particle physics and related areas of science. The 38th conference was held in Chicago, 3-10 August 2016, and about 1,300 people took part in it. From NSU and BINP with the report on the results of work on the complex VEhPP 2000 spoke Head of Department of Physics and Technology at Physics Department of NSU, head of the laboratory in search of interactions beyond the Standard Model in experiments with muons Fermilab Ivan Logashenko.
— The report was dedicated to the measurements that are carried out on the accelerator-storage complex VEhPP-2000 detector KMD-3 and UMP at the Institute of Nuclear Physics. I presented an overview of the current results from both detectors and told about measurement (probability) of strongly interacting particles, the hadrons in electron and positron annihilation being born. The measurement of this quantity in the range of energies accessible to VEhPP 2000, arouses great interest. To get the result, we need to conduct some experiments. When an electron and positron annihilate, many different combinations of strongly interacting particles are born. We study each combination separately, with the result that allows us to get the total probability of hadron production in the process.
The report of the VEhPP-2000 was presented in the section, which discusses the measurement of the anomalous magnetic moment of the muon. According to Ivan Logashenko, experiment on the investigation of this value will start at Fermilab the next year and will last for several years. NSU and BINP are taking part in it.
— The anomalous magnetic moment of the muon allows us to estimate how completely we understand the basic laws of physics, whether there are forces other than those, which are described by the Standard Model. This value is unique. It can be measured with very high accuracy, calculated both experimentally and theoretically ways, - says Ivan Logashenko.
A recent measurement of the quantity was carried out in the early 2000s at Brookhaven National Laboratory (USA). Back then, the accuracy was 0,54 × 10-6. A new dimension in a planned experiment at Fermilab will achieve accuracy 0,14 × 10-6 - four times better.
The work, which is performed by Siberian scientists in the study of hadrons in the complex VEhPP 2000, is necessary for the theoretical calculation of the anomalous magnetic moment of the muon. From the results obtained on VEhPP 2000, depends the accuracy of the calculation in Fermilab's experiment.
Ivan Logashenko notes that scientists seek to compare two values to be obtained experimentally and theoretically:
- According to the results of previous experiments, these numbers did not match, they differed strongly enough for three or four standard deviations, but not so much that we could argue that we see existence of new physics. Experiments on VEhPP-2000 will improve the accuracy of the theoretical calculation, but a new experiment in Fermilab - measurement accuracy. If we confirm the presence of significant differences between experiment and theory to a new level of accuracy, it will give information about the existence of physics beyond the Standard Model.
